Particularly I found two with units and buildings that were invisible when I was playing yesterday. More specifically, when I used a caravel to shoot enemy fishingboats, the fishingboats turned the boat, but the caravel did'nt stop firing, although they remained alive and invisible.
As far as invisible buildings are concerned, there is an enemy fort, which at first my explorer explored it when it was still under construction. When I returned, it was already fully built, but the fort was remain with the same framework of the moment it was explored.
Third problem. There' inconsistencies when it comes to personalizing the city of Rio de Janeiro with regard to the colors presented in the miniature and buildings themselves, I may be wrong in conceiving a bug, because I don't know if the absence and incompatibility of building's colors with the miniatures depend on merely of future updates.